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Patent US3264231A successfully refreshed from Google Patents.
US3264231A
Expired / Lapsed
US
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Hydroxy (polyalkylenoxy) alkyl hydrazine based polyurethanes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1962-12-10
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Granted: 1966-08-02
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Expires: 1982-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ibbotson Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
41 words
A PROCESS FOR THE PREPARATION OF CELLULAR POLYURETHANES WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE, AND A POLYETHER POLYOL, IN THE PRESENCE OF A BLOWING AGENT SELECTED FROM THE GROUP CONSISTING OF WATER AND FLUOROALKANES SAID POLYETHER POLYOL BEING OF HE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |